<template>
    <div class="list" ref="wrapper">
        <div>
            <div class="area">
                <div class="title border-topbottom">
                    当前城市
                </div>
                <div class="button-list">
                    <div class="button-wrapper">
                        <div class="button">{{city}}</div>
                    </div>
                </div>
            </div>
            <div class="area">
                <div class="title border-topbottom">热门城市</div>
                <div class="button-list">
                    <div class="button-wrapper" v-for="city in hot" :key="city.id" @click="handleCityClick(city.name)">
                        <div class="button">{{city.name}}</div>
                    </div>
                </div>
            </div>
            <div class="area" v-for="(item,key) in cities" :key="key" :ref="key">
                <div class="title border-topbottom">{{key}}</div>
                <div class="item-list">
                    <div class="item border-bottom" v-for="city in item" :key="city.id"  @click="handleCityClick(city.name)">
                       {{ city.name}}
                    </div>
                </div>
            </div>
        </div>
    </div>
</template>

<script>
    import { mapState, mapMutations } from 'vuex'
    import Bscroll from 'better-scroll'
    export default {
        name:'CityList',
        props:{
            cities:Object,
            hot:Array,
            letter:{
                type:String,
                default:'A'
            }
        },
        computed:{
            ...mapState(['city'])
        },
        methods:{
            handleCityClick(city){
                 this.changeCity(city)
                 this.$router.push('/')
            },
            ...mapMutations(['changeCity'])
        },
        mounted(){
           this.$nextTick(() => {
                this.scroll = new Bscroll(this.$refs.wrapper, {
                      click: true
                })
            })
        },
        watch:{
            letter(){
                if(this.letter){
                    const element=this.$refs[this.letter][0];
                    this.scroll.scrollToElement(element);
                }
            }
        }
    }
</script>

<style scoped lang="scss">
    .title{
        line-height:0.54rem;
        padding:0 0.2rem;
        background:#eee;
        color:#666;
        font-size:0.26rem;
        &:before{
            border-color:#ccc;
        }
        &:after{
            border-color:#ccc;
        }
    }
    .button-list{
        padding:0.1rem;
        overflow:hidden;
        padding: 0.1rem 0.6rem 0.1rem 0.1rem;
        .button-wrapper{
            float:left;
            width:33.33%;
            .button{
                margin:0.1rem;
                padding:0.1rem 0;
                text-align:center;
                border:0.02rem solid #ccc;
                border-radius:0.06rem;
            }
        }
    }
    .list{
        overflow:hidden;
        position:absolute;
        top:1.58rem;
        left:0;
        right:0;
        bottom:0;
    }
    .item-list{
        .item{
            line-height:0.76rem;
            color:#666;
            padding-left:0.2rem;
             &:before{
                border-color:#ccc;
            }
        }
    }
</style>